<!DOCTYPE html>
<html lang="en">
<head>
    <meta charset="UTF-8">
    <title>这是css嵌入代码</title>
   <style>p{
       background-color: #00539F;
       font-size: 2em;
       text-align: center;
   }</style>
</head>
<body>
<p>hello world</p>
</body>
</html>